5,216
Participants
Start Date
November 20, 2018
Primary Completion Date
April 1, 2022
Study Completion Date
September 30, 2023
No intervention
No intervention
School of Public Health of Sun Yat-sen University (North Campus), Guangzhou
Huizhou No.1 Maternal and Child Care Service Cencer
UNKNOWN
Sun Yat-sen University
OTHER